Camera attachment.



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UNITED STATES PATENT OFFICE.V

LOUIS M. PIERRON AND HERMANN R. MILLER, OF MILIVAUKEE, WISCONSIN.

CAM ERA ATTACH M ENT'.

SPECIFICATION forming part of Letters Patent No. 659,592, dated October9, 1900.

Application tiled October 9,1899. Serial No. 732,994. (No model.)

county of Milwaukee and State of Wisconsin,

have invented certain new and useful Improvements in Camera Attachments;and we do hereby declare that the following is a full, clear, and exactdescription thereof.

ro Our invention has for its purpose to provide means for the distortionof images of objects projected into an ordinary photographic camera; andit consists in certain peculiarities of construction and combination ofparts I5 hereinafter particularly set forth, with reference to theaccompanying drawings, and subsequently claimed.

. Figure 1 of the drawings is a diagram illustrating a generalconstruction and arrangezo ment of parts embodied in our invention andtheir relative arrangement with respect to an ordinary photographiccamera, the outlines of the box, ground-glass back, and lensholder ofthe camera being represented by broken lines; Fig. 2, a front or rearelevation of a double-convex lens, such as is commonly employed inphotographic cameras; Fig. 3, a perspective view of a vertically-slottedbut otherwise opaque screen constituting a part of the 3o means designedfor the purpose above stated,

and Fig. 4 a similar view of a horizontallyslotted but otherwise opaquescreen surmounted by an exterior cylindrical lens crosswise of the slot.

3 5 Referring by letter to the drawings, A indicates the box, B theground-glass back, C

the tubular lens-holder, and D the doubleconvex lens, of an ordinaryphotographic camera. At intervals within holder C, forward 4o of thedouble-convex lens D, we show centrally-slotted but otherwise opaquescreens E F, the slot of one being at right angles to that of the other,and forward of the screen F, crosswise of its slot, is a cylindricallens G, it being preferable in some instances to unite these last twoelements of lthe combination.

We have shown the slot of screen E in a vertical direction and the slotof screen F in 5o a horizontal direction; but said screens, with thecylindrical lens G, may be turned on a common axis to exactly reversethe direction of their respective slots or have each of these slotsstand at a right angle to the other at any degree within one-quarter ofa circle.

In practice the combination of slotted screens and cylindrical lens,above specified, is focused upon an object, and the optical resultobtained by said screens and lens in conjunction with the double-convexlens is a distortion of the whole image of the object projected in thecamera in a direction vertical, horizontal, or at an angle of any degreebetween a vertical and horizontal. The dotted line H in Fig. 1represents the diameter of the aforesaid circle, and the dotted linesIiu same figure indicate the path of pencils of light-rays employed toproject the image of the focused object within the camera upon itsground-glass back or an interposed sensitive device, such asphotographic plate or Hm.

From the foregoing it will be understood that the pencils of light-raysfrom the center of the focused object will first strike the cylindricallens G and slot in screen F, and with respect to sharpness of theprojected image of said object the organization of the apparatus is suchas to admit of no more of the light than is absolutely necessary toobtaining the desired optical result. The light admitted through screenF passes on through the slot in screen E and is finally projected uponthe ground glass of the cameraor an interposed sensitive photographicplate or film. If the slotted screens and cylindrical lens are in thearrangement herein shown, the whole of the projected image of thefocused object will be proportionately distorted in a verticaldirection; but if said screens and lens be turned one-quarter of acircle the distortion will be in a horizontal directiomand it alsofollows that the direction of distortion may be at any angle betweenvertical and horizontal. If a human form be utilized as an object, theprojected image of the same will appear short and stout or long and thinaccordingly as the slotted screens and cylindrical lens are turnedtogether on their common axis of rotation to have the slot in screen Fhorizontal or vertical and at right angles to the slot in the other ofsaid screens.

To vary proportions of the focused image projected in the camera, thescreen E will be utilized forward of screen F at a greater or IOO lessdistance, this being a mere change in arbeing at right angles to eachother, and a cylindrical Vlens opposing one of the screens ersswise ofits slot.

In testimony that we claim the foregoing ',we have hereunto setonrhands,at Milwaukee,

in the county of Milwaukee and State of Wiscousin, inthe presence of twowitnesses.

, LOUIS M. PIERRON.

HERMANN R. MILLER. Witnesses:

N. E. OLIPHANT, B. C. RoLoFF.

